There are many instruments that are designed to be powered by a 12v battery...and that's essentially what you seek. Search around in here for some recommendations. For example, I use a Lowel i-Light with an NRG battery belt. It can be camera-mounted, hand-held or stand mounted. It also features a nice set of barn doors (extra) and a dichroic filter (also extra) will conveniently convert the lamp to daylight K. It's an excellent portable and relatively economical solution.

But there are many such alternatives.

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I use the XLR connection which mates to my NRG batteries. If you're not going to use the light on-camera and/or with A-B batteries there's no reason to go that route. The next generally handy connection would be the cigarette lighter adapter.

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